PP复合膜的有机改性及其力学性能分析

Analysis the Organic Modification and Mechanical Properties of PP Composite Film

聚丙烯(PP)与有机改性蒙脱土(OMMT)的相容性较差,OMMT在PP中的分散程度能影响复合材料的性能,因此,将马来酸酐接枝聚丙烯(PP-g-MAH)作为增容剂,通过二次熔融挤出法制备具有不同PP-g-MAH/OMMT分散配比和不同OMMT含量的PP复合母料,并采用流延方法挤出厚度约为15μ的复合膜,采用X射线衍射分析、差示扫描量热等方法分析不同PP-g-MAH/OMMT配比和不同含量的OMMT对PP复合膜的相容性及力学性能的影响。研究结果表明,PP-g-MAH能提高OMMT与PP的相容性,OMMT的含量在一定范围内增大了复合膜的结晶度和拉伸强度,但是大幅降低了复合膜的延展性,使复合膜的断裂伸长率有小幅下降,当PP-g-MAH/OMMT的配比为1.5,OMMT添加量为2.0%时,制得的复合膜的综合性能最佳。

Polypropylene( PP) was incompatible with organic modified montmorillonite( OMMT). The dispersion of OMMT could affect the properties of composite film. Maleic anhydride grafted polypropylene( PP-g-MAH) was used as compatibilizer to prepare composites master batchwith different PP-g-MA/OMMT ratios and different OMMT content by secondary melt extrusion and the composite film with thickness of about 15μ was extruded by means of flow extension. The structure and mechanical properties of the composite film were investigated by means of X-ray diffraction,isothermal differential scanning calorimetry analyses ect. The results showed that the PP-g-MA could affect the dispersion degree of OMMT,the dispersion state of OMMT could affect the crystallinity of PP,and OMMT could improve the tensile strength of the composite film,but it would greatly reduce the ductility of the composite film,and the elongation at break of composite film decreased. When the PP-g-MAH/OMMT ratio was 1. 5,and the OMMT content was 2. 0%,the comprehensive properties of the composite film were best.